SUBARU LEGACY 1996 Service Repair Manual

B4M0905A
10AE11
CHECK MOTOR OPERATION.
1) Measure voltage between ABSCM connector terminal.
2) Operate the check sequence. <Ref. to 4-4 [W22D1].>
: Connector & terminals
(F49) No. 10 (+)—No.1()
Does the voltage raise from less than 1.5 V
to 10—13 V, and return to less than 1.5 V
again when carrying out the check
sequence?
Can motor revolution noise (buzz) be heard
when carrying out the check sequence?
: Go to step10AE12.
: Replace hydraulic unit.
10AE12CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN HYDRAULIC UNIT,
RELAY BOX AND ABSCM.
: Is there poor contact in connector between
hydraulic unit, relay box and ABSCM?
: Repair connector.
: Go to step10AE13.
10AE13
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
241
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0971
AF: 52 MOTOR
—ABNORMAL MOTOR—
DIAGNOSIS:

Faulty motor

Faulty motor relay

Faulty harness connector
TROUBLE SYMPTOM:

ABS does not operate.
10AF1.Check contact point of motor relay.
10AF2.Check input voltage of relay box.
10AF3.Check motor ground.
10AF4.Check motor operation.
10AF5.Check poor contact in connector between
hydraulic unit, relay box and ABSCM.
10AF6.Check ABSCM.





242
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1049
243
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0887A
10AF1CHECK CONTACT POINT OF MOTOR
RELAY.
1) Turn ignition switch to OFF.
2) Remove motor relay from relay box.
3) Connect battery to motor relay terminals No. 85 and No.
86.
4) Measure resistance between motor relay terminals.
: Terminals
No. 30—No. 87
Is resistance less than 0.5Ω?
: Go to next step.
: Replace motor relay.
B4M0888A
5) Disconnect battery from motor relay terminals.
6) Measure resistance between motor relay terminals.
: Terminals
No. 30—No. 87
Is resistance more than 1 MΩ?
: Go to step10AF2.
: Replace motor relay.
B4M0890B
10AF2CHECK INPUT VOLTAGE OF RELAY
BOX.
1) Disconnect connector (F8) from relay box.
2) Measure voltage between relay box connector and
chassis ground.
: Connector & terminal
(F8) No. 2 (+)—Chassis ground ()
Is voltage 10—13 V?
: Go to step10AF3.
: Repair harness connector between battery and
relay box. Check fuse SBF6.
244
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0808
10AF3
CHECK MOTOR GROUND.
: Tightening torque:
32±10 N⋅m (3.3±1.0 kg-m, 24±7 ft-lb)
Is the motor ground terminal tightly
clamped?
: Go to step10AF4.
: Tighten the clamp of motor ground terminal.
B4M0905A
10AF4
CHECK MOTOR OPERATION.
1) Disconnect connector (F49) from ABSCM.
2) Disconnect connector cover from ABSCM connector
(F49). <Ref. to 4-4c [T8C1] steps 5) to 8).>
3) Connect connector (F49) to ABSCM.
4) Connect motor relay to relay box.
5) Connect all connectors.
6) Measure voltage between ABSCM connector terminal.
7) Operate the check sequence. <Ref. to 4-4 [W22D1].>
: Connector & terminals
(F49) No. 10 (+)—No.1()
Does the voltage raise from less than 1.5 V
to 10—13 V, and return to less than 1.5 V
again when carrying out the check
sequence?
Can motor revolution noise (buzz) be heard
when carrying out the check sequence?
: Go to step10AF5.
: Replace hydraulic unit.
10AF5CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN HYDRAULIC UNIT,
RELAY BOX AND ABSCM.
: Is there poor contact in connector between
hydraulic unit, relay box and ABSCM?
: Repair connector.
: Go to step10AF6.
245
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10AF6
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
246
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0972
AG: 54 BLS
—ABNORMAL STOP LIGHT SWITCH—
DIAGNOSIS:

Faulty stop light switch
TROUBLE SYMPTOM:

ABS does not operate.
10AG1.Check output of stop light switch using select
monitor.

10AG2.Check if stop lights come on.
10AG3.Check open circuit of harness.
10AG4.Check poor contact in connector between
stop light switch and ABSCM.
10AG5.Check ABSCM.




247
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

WIRING DIAGRAM:
B4M1041
248
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

B4M0973
10AG1CHECK OUTPUT OF STOP LIGHT
SWITCH USING SELECT MONITOR.
1) Press F,0and 9on the select monitor.
2) Depress the brake pedal.
3) Read the stop light switch output on the select monitor
display.
: Is the reading indicated on monitor display
less than 1.5 V?
: Go to next step.
: Go to step10AG1.
4) Release the brake pedal.
5) Read the stop light switch output on the select monitor
display.
: Is the reading indicated on monitor display
greater than 4.5 V?
: Go to step10AG4.
: Go to step10AG2.
10AG2
CHECK IF STOP LIGHTS COME ON.
Depress the brake pedal.
: Do stop lights turn on?
: Go to step10AG3.
: Repair stop lights circuit.
B4M0908A
10AG3
CHECK OPEN CIRCUIT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABSCM.
3) Depress brake pedal.
4) Measure voltage between ABSCM connector and chas-
sis ground.
: Connector & terminal
(F49) No. 36—Chassis ground
Is voltage 10—13 V?
: Go to step10AG4.
: Repair harness between stop light switch and
ABSCM.
249
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor

10AG4CHECK POOR CONTACT IN CONNEC-
TOR BETWEEN STOP LIGHT SWITCH
AND ABSCM.
: Is there poor contact in connector between
stop light switch and ABSCM?
: Repair connector.
: Go to step10AG5.
10AG5
CHECK ABSCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the trouble code.
: Is the same trouble code as in the current
diagnosis still being output?
: Replace ABSCM.
: Go to next.
: Are other trouble codes being output?
: Proceed with the diagnosis corresponding to the
trouble code.
: A temporary poor contact.
250
4-4cBRAKES [ABS 5.3 TYPE]
10. Diagnostics Chart with Select Monitor